What two primary physical characteristics dictate a star's absolute radiance?
Answer
Physical dimensions and surface temperature
A star's absolute radiance, or luminosity, is determined by a sophisticated interplay between its physical size (which relates to surface area) and how hot its surface is.

#Videos
Why Would The Size Of A Star Affect Its Luminosity? - Physics Frontier
Related Questions
What intrinsic property measures the total energy a star radiates into space every second?What two primary physical characteristics dictate a star's absolute radiance?If two stars have the exact same surface temperature, how does the larger star's luminosity compare?What effect does higher stellar mass have on the star's life cycle?How does a star's surface temperature affect the energy emitted per unit area?Which type of star is characterized by a very long lifespan due to slow fuel consumption?What scenario allows a smaller, very hot star to outshine a substantially larger, cooler star?What does the Hertzsprung-Russell (H-R) diagram plot to organize stars?What limits the theoretical upper boundary for how large and bright a stable star can become?Why might a star that is intrinsically very luminous appear faint when viewed from Earth?